Some peculiarities of inflorescences morphogenesis in Brexia (Celastraceae)

  • Ivan A. Savinov Moscow State University of Food Production, 33 Talalichina str., Moscow, 109316, Russia

Abstract

Comparative analysis of inflorescences structure for 6 species of the Brexia (according to the last revision by Schatz & Lowry II (2004)) is conducted. For one species, B. madagascariensis, the shoots growth and development, inflorescence morphogenesis details are studied. It is determined inflorescences of Brexia species (have described in literature as cymes, pseudo-umbellate, corymbiform, sessile in fascicles; and including for some species cauliflory) presents a different variations of ancestral form transformation – dichasial system (closed thyrse). Apparently, presence of a big bracts may be consider as ancestral, plesiomorphic character for the genus; and derivate ones – reduction of bracts and presence of minute bracteoles in pedicel basis only. Inflorescences of Brexia in typically may be considered as bracteous. Process of reduction the number of clusters and separate flowers is accompanied by different variations of their transformations.

References

Савинов И.А. 2007. Морфологическая интерпретация нектарного диска в цветке Celastraceae и нектарников-стаминодиев цветков Brexia и Parnassia. Мат-лы конф. по морфологии и систематике растений, посвященной 300-летию со дня рождения К. Линнея (г. Москва, 16-19 мая 2007): 207–209.
Савинов И.А. 2008. Эволюция цветка в порядке Celastrales. Бот. журн. 93(10): 1544–1555.
Angiosperm Phylogeny Group (APG) 2009. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. Bot. J. Linn. Soc. 161: 105–121.
Halle F., Oldeman R., Tomlinson P.B. 1978. Tropical trees and forests. An architectural analysis. Springer, Berlin.
Matthews M.L., Endress P.K. 2005. Comparative floral structure and systematics in Celastrales (Celastraceae, Parnassiaceae, Lepidobotryaceae). Bot. J. Linn. Soc. 149: 129–194.
Savinov I.A. 2009a. The comparative floral structure of Brexia, Parnassia and some Celastraceae. In: Ivanova D. (ed.), Plant, fungal and habitat diversity investigation and conservation (Proceedings of IV Balkan Botanical Congress, Sofia, 20–26 June 2006): 65–71.
Savinov I. 2009b. Late stages of floral development and phylogeny of the Celastrales. Systematics 2009 (Proceedings of the Symposium «Flowers on the tree of life», Leiden): 112.
Schatz G.E., Lowry II P.P. 2004. A synoptic revision of Brexia (Celastraceae) in Madagascar. Adansonia. Sér. 3 26(1): 67–81.
Zhang Li-Bing, Simmons M.P. 2006. Phylogeny and delimitation of the Celastrales inferred from nuclear and plastid genes. Syst. Bot. 31(1): 122–137.
Fig. 2. Some stages of inflorescence morphogenesis in Brexia madagascariensis.
Published
2013-04-01
How to Cite
SAVINOV, Ivan A.. Some peculiarities of inflorescences morphogenesis in Brexia (Celastraceae). Modern Phytomorphology, [S.l.], v. 3, p. 161-165, apr. 2013. ISSN 2227-9555. Available at: <http://ojs.phytomorphology.org/index.php/MP/article/view/345>. Date accessed: 11 apr. 2018. doi: https://doi.org/10.5281/zenodo.162008.
Section
Research Articles